LED display more professional terminology, just contact with LED peers are often not sure what they mean, the author sorted out the terms below to help you understand the LED product principle, the rapid growth of LED's "industry professionals." 1, LED brightness The brightness of a light-emitting diode is generally expressed in luminous intensity (Luminous Intensity) in candela cd; 1000ucd = 1mcd and 1000mcd = 1cd. Indoor single LED light intensity is generally 500ucd-50mcd, while the outdoor single LED light intensity should generally be 100mcd-1000mcd, or even 1000mcd above. 2, LED pixel module The LEDs are arranged in matrix or pen segments and are prefabricated into standard sized modules. Indoor LED display commonly used 8 * 8 pixel module, 8-digit 7-segment digital module. Outdoor display pixel module 4 * 4,8 * 8,8 * 16 pixels and other specifications. Pixel module for outdoor display because each pixel by more than two LED tube bundle, it is also known as the header bundle module. 3, pixel and pixel diameter Each LED display can be individually controlled LED light-emitting unit (dot) called pixel (or pixel). Pixel diameter ∮ refers to the diameter of each pixel, the unit is mm. For indoor display, usually a single LED, the shape of a circle. Indoor display pixel diameter school are common ∮3.0, ∮3.75, ∮5.0, ∮8.0, etc., of which ∮3.75 and ∮5.0 up. In the outdoor environment, in order to increase the brightness and increase the line-of-sight, one pixel contains two or more cluster LEDs. Since two or more cluster LEDs are generally not circular, the pixel diameter of the outdoor display is generally expressed in terms of the average distance between two pixels : 10,11.5,16,22,25. 4, point spacing, pixel density and information capacity LED display two or two pixel center distance or dot pitch (DotPitch); the number of pixels per unit area is called the pixel density; unit area contains the amount of display content is called the information capacity. The essence of these three is to describe the same concept: the dot spacing is the distance between two pixels to reflect the pixel density, dot spacing and pixel density is the physical properties of the display; information capacity is the information carrying capacity of pixel density The number of units. The smaller the dot spacing, the higher the pixel density, the more information capacity, the closer the distance for viewing. The greater the dot spacing, the lower the pixel density, the less information capacity, the farther the distance for viewing. 5, resolution The number of rows and columns of the LED display pixel is called the resolution of the LED display. The resolution is the total number of pixels in the display, which determines the information capacity of a display. 6, LED display The LED pixel module assembled according to the actual needs of the size arranged in a matrix, together with a dedicated display driver circuit, DC power supply, software, frames and exterior decoration, which constitutes a LED display.